fix: downgrade eslint to v8 on application files

[micalevisk]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

Issue Number: closes nestjs/nest#14092

What is the new behavior?

no errors on running npm run lint on a brand new nestjs project

Does this PR introduce a breaking change?

• Yes
• No

Other information

until we migrate the eslint config to their new format, we cannot use eslint@9

[kamilmysliwiec]

LGTM